I once had sort of the opposite problem:
I was a a clients office, fixing various desktop issues, and I was asked to fix something (email related?) for a particular user, who wasn't at their desk. I sat down and started to troubleshoot, but there was something wrong with the mouse. I flipped it over and found someone had taped a two pence coin to the bottom. Once I'd removed that it worked fine, and I got to work fixing whatever the problem was.
After a bit the user came back into the office, phone practically glued to their ear. Once they'd got off the phone, I showed them the fixed computer, and mentioned that I'd had to remove the 2p and they replied: "I stuck that there, it's to protect me from the electromagnetic radiation".
As I was at a clients office, I restrained myself from going full BOFH, and just said "Have you tried closing your window blinds?" and left.
After all, the sun really is a source of harmful EM radiation, as anyone who's had sun-burn can attest.